The scheduling assistant feature on the change Conflict Calendar always returns "No availability found, try again. There is no availability within 90 days of ". The continue searching option never finds availability.
When reviewing the Network tab in the browser's console when opening the Schedule Assistant in the Conflict Calendar page, there is a response "Cannot find available times due to maintenance schedules that do not overlap.". This message suggests that the maintenance schedules are not configured properly, maintenance schedules do not appear to have schedule entries.
Maintenance Schedules should have at least 1 Schedule Entry where you define a set window of time in which a change can be performed.